A ribbon for formatting a dynamic chart is visible whenever the dynamic chart task pane is open. You can edit  the currently selected dynamic chart.

The Chart styles section contains two formatting buttons that apply formatting to the chart. The Standard button resets the selected chart's formatting to the standard Anaplan XL format.

The IBCS button resets the selected chart's formatting to the IBCS defaults.

The dynamic chart formatting pane toggle button enables you to change your own custom formatting.

When the category axis is selected either on the chart or from the dropdown in the ribbon, the semantic axis option is available.

This allows you to set the axis as a thin, thick, or double in appearance and enable a separator at any category number.